14821
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 14822
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 14820
- Möbius Function
- -1
- Radical
- 14821
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 164
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1736
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Quintan primes: p = (x^5 + y^5)/(x + y).at n=17A002650
- Numbers k such that the continued fraction for sqrt(k) has period 85.at n=13A020424
- Least m such that if r and s in {1/1, 1/3, 1/6,..., 1/C(n+1,2)} satisfy r < s, then r < k/m < s for some integer k.at n=42A024826
- Numbers k such that 105*2^k+1 is prime.at n=41A032402
- Third term of strong prime 5-tuples: p(m-1)-p(m-2) > p(m)-p(m-1) > p(m+1)-p(m) > p(m+2)-p(m+1).at n=33A054810
- Centered 19-gonal numbers.at n=39A069132
- Centered 20-gonal (or icosagonal) numbers.at n=38A069133
- Primes of the form (prime(k-1)+1)*(prime(k+1)-1) + 1, k>1.at n=9A087106
- a(n) = (15*n^4 + 22*n^3 + 45*n^2 + 14*n) / 24.at n=12A101166
- Numbers k such that 4*10^k - 11 is prime.at n=15A102738
- Primes connected to two primes by the (p+1)/2 and 2p-1 operators.at n=35A109835
- Left truncatable primes in base 9 (written in decimal form).at n=45A129945
- Prime numbers n such that n^2 +- (n-1) are primes.at n=35A137459
- Numbers k such that 12^k + 11 is prime.at n=6A137654
- Primes congruent to 16 mod 47.at n=37A142367
- Primes congruent to 23 mod 49.at n=39A142433
- Primes congruent to 34 mod 53.at n=32A142564
- Primes congruent to 12 mod 59.at n=30A142739
- Primes congruent to 59 mod 61.at n=29A142857
- Number of ON states after n generations of cellular automaton based on f.c.c. lattice with each cell adjacent to its twelve neighbors.at n=26A151776